Mint Plant Problems


Hi there,

I need advice how to treat a disease for my mint plant which
I had aquiered about 2 months ago from Farm Boy store.
I had a wonderfull pot plant in my apartment until about 2 weeks ago
when I started to see grey -brownish spots on leaves and brownish
tinny dots .I ultimately found the plant today when I came back from work
in a poor condition.
I end up by using a sulfur powder in water and I added 2 drops of liquid
nutrients (I got them from Canadian Tire)
Attached you will see the leaves I cutted and the whole plant after I clean
each leave with diluted medicinal alcohol.It was probable not the best idea
but I don’t have any other product to use for this fungus or parasite ,whatever
it is.So I am in need for advice and help .If you can examine the photos and tell
me what do you suspect can be the culprit and how should I proceed .
Thank you in advance for feed back .


Thank you for forwarding a photo of your mint plant. It may have been better if you had taken the picture before you treated it; as you mention, using the sulfur, liquid nutrients and medicinal alcohol probably did not help you mint plant. Identifying the cause of the problem should be done before any treatment can be recommended.

At first glance,  it seems that the mint is in a relatively small pot inside a larger pot. The roots of the mint need some room to grow in order to sustain the leaves. The symptoms that you describe are probably a type of leaf spot that occurs when there is too much moisture in the soil and around the plant. The leaves appear to be yellow which is also a result of too much water in the soil for the plant. It’s important that the soil has good drainage in the pot–it’s not good for the plant roots to sit in water–air is a necessary component of any growing mix.

The good news is that mint is a rampant grower and can be grown successfully in containers or pots. You may be able to revive your mint plant by removing it from the pot that it is presently in. Use a larger pot and fill it halfway with a good draining potting soil. When you remove the plant, you will probably notice long whitish roots; if there are parts that seem somewhat soggy, cut them off and place the healthy-looking ones onto the soil–then cover with more soil and tamp it down a bit. You may have to cut off some of the leaves; if the root is still viable, new growth will emerge from the soil in a week or so.

Mint prefers moist soil that is not overly wet. Only water enough to wet the soil–excess water should be allowed to drain from the pot. Water only when the top part of the soil is slightly dry to the touch. Place the pot in a warm area that gets indirect light in the summer and more sunny in the fall and winter months. To keep the plant from becoming lopsided, you should rotate it every few days.

Fertilizing a mint plant is not necessary–too much fertilizer may cause the plant to lose some flavour. However, one might use a fish emulsion fertilizer at half strength when the plant has grown for several months. If your plant continues to grow, you may consider taking cuttings to start new plants. Just cut off a sprig with leaves; remove the bottom-most leaves (leaf node) and put it into a small glass of water; roots will form within a couple weeks. Simply plant in a pot of soil and you will soon have another mint plant to enjoy.

Good luck with your mint plant. Let us know if it recovers.